`Na^(+), Mg^(2+), Al^(3+)`, and `Si^(4+)` are isoelectronic ions. Their ionic size will follow the order

Options

A. `Na^(+) gt Mg^(2+) gt Al^(3+) lt Si^(+4)`
B. `Na^(+) gt Mg^(2+) lt Al^(3+) gt Si^(+4)`
C. `Na^(+) gt Mg^(2+) gt Al^(3+) Gt Si^(+4)`
D. `Na^(+) gt Mg^(2+) gt Al^(3+) lt Si^(+4)`

Answer

C

Explanation

In isoelectronic cations, the size decreases with increases in nucler charge
`Na^(+) gt Mg^(2+) gt Al^(3+) gt Si^(4+)`